I understand you to say that within your Roth IRA account you have a $100 cash balance in addition to shares of stock, and that the $100 is left over from previous purchases. (It may also include any dividends paid on the shares you own in the account.)

The $2K limit relates only to the amount you can add to your Roth IRA account. It has nothing to do with the amount you can invest in a given year. Therefore, you are free to combine the $2K from this year with the cash already in your account and invest all of it without any restrictions. You could also sell part of your exisiting holdings if you wanted to and reinvest that cash. Tax rules allow you to make whatever buy sell transactions you like within the account and as often as you like.

In short, yes you can add them. Your purchases are not limited to $2K.

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